Ignition-magneto for four-cylinder internal-combustion engines.



R. A. PERSIN.

IGNITION MAGNETO FOR FOUR-CYLINDER INTERNAL COMBUSTION'ENGINES.

APPLICATION FILED 1ULY25, 1917- 1,285,359. Patented Nov. 19,1918.

UNITED STATES PATENT OFFICE.

RAOUL ANDRE PEBSIN, o vuLIERs LE IBELLEBANGE, ASSIGNOB 'ro nriusnnrnrmHENRY ANTOINE LEFEVRE, or PARIS, FRANCE.

IGNITION-MAGNETO FOR FOUR-CYLINDER INTERNAL-COMBUSTION ENGINES.

. Specification of Letters I'atent. A Patented Nov, 19, 1918.

Application filed July 25, 1917. Serial No. 182,809.

armature, and this arrangement entails a certain amount of complicationfrom a con- 'ject to provide an improved apparatus structional point ofview. With the object of remedying this drawback, an arrangement of thewinding of the armature has already been proposed in such a manner as toproduce in the case of a double T Siemens armature, four sparks perrevolution, that is to say, two sparks simultaneously at each 180 of thearmature. When the magneto is employed-for the purpose of igniting a*l-cylinder engine, in such a case two sparks will be producedsimultaneously, namely, one spark in one cylinder during the period ofcompression, and the other spark in a cylinder during the period ofexhaust.

In such an arrangement the two sparking plugs at which these two sparksare simultaneously produced, have hitherto been situated in'one and thesame secondary circuit, the inlet and outlet of which are connected totwo contacts of the distributer and should be completely insulated.

Constructions of that kind have the two following main drawbacks 1. Froman electrical point of view the two sparks occur in media that opposedifferent resistances. The spark produced in the cylinder in whichcompression is taking place, will encounter in the compressed mixture ahigher resistance than the spark occurring in the cylinder in whichexhaust is taking place. Consequently the former spark which aloneserves a useful urpose is weak. whereas the other spark which is of noutility, is a strong spark.

,2. From a constructional point of view the insulation of the two endsof the secondary circuit presents various difiiculties, moreparticularly in machines of small size.

The present invention has now for its lobt at will remedy the abovestated drawbacks.

This improved apparatus is characterized circuit f essentially by the.provision of two independent secondary circuits each having 1ts point ofdeparture in the framing of the machine, and feeding respectively thetwo sparking plugs at which the sparks are to be producedsimultaneously.

In these circumstances, these two sparking plugs into which the currentis passed simultaneously by the distributor, .are fed by two distinctsecondary circuits, and the spark produced at each of these plugs willhave its maximum intensity.

In the accompanying drawings Figure 1 illustrates by way of example in adiagrammatic manner one way of constructing, the improved apparatusaccording to this invention, and f Fig. 2 illustrates a modificationthereof.

In the example of the apparatus illustrated in Fig. 1, the armature hastwo cores (1, b the primary circuit 0 is wound on these two cores andits ends are connected in the usual manner on one hand to the framing dof the machine and on the other hand to an interrupter e of knownconstruction. Each of the cores (1, b is wound with a secondary g, theends of which are connected on one hand likewise to the framing d and onthe other hand to the two contacts h i of a distributer j ofthe usualconstruction.

These contacts in rotating come into contact with the two brushes is Zconnected to the two sparking plugs m n where the sparks are to beproduced simultaneously, and with the two brushes 0 p connected to thesparking plugs q r of the other two cylinders. I

Fig. 2 shows a modification in which the armature comprises a singlecore on whlch are wound the two secondary circuits 7 g. The ends ofthese last two circuits are connected in the same manner as in thepreceding example.

The rotary core 8 on which the contacts 72. i are mounted, rotates atthe. same speed as the armature of the magneto, and these contacts arelocated in such amanner that at each rupture of the primary ClI'Clllt,they will be either opposite the brushes is] or opposite the brushes 07). Thus for instance in the position shown in the figure, the twosparks will be produced at the two sparking plugs m n, and when thearmature shall have rotated through 180, the contacts h and. 5 havingcome into. contact w1th the brushes o p, the two sparks will be producedat the two sparking plugs g r.

It is to be understood that the constructional details of the improvedapparatus 5 may be modified according to the purposes for which it is tobe used.

What I claim is a In an ignition magneto for a four-cylinder internalcombustion engine, a single 1 collector, having two contacts 90 apart, a

double transformer comprising two separate secondary windings connectedrespectiyely to said two contacts and four brushes 90 apart connectedrespective to four sparking plugs, said brushes rub ing 15 upon thecontacts of the collector.

